Delete row ('518', '20731') from daily_volatility

ticker_id 518
day 20731
implied_open 0.7651512791598797
implied_high 0.8032500980392098
implied_low 0.736577165000382
implied_close 0.7746759838797123
historical_open 0.5746571847632291
historical_high 0.5746571847632291
historical_low 0.5746571847632291
historical_close 0.5746571847632291
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